Short circuit on door motor 1 output(s)
Check the door motor, cable harness and connectors for mechanical damage. If the resistance measured through the motor circuit (when disconnected from the DCU) is lower than approximately 2.5 ohms it can cause overcurrent.
What you'll see
The door leaf is likely not moving at all, or might be moving in an abnormal way.
System reaction
The DCU tries to run the motor but aborts if the fault appears so the door leaf cannot move properly since the electric circuit through the motor is faulty. This fault will also trigger DTC 0312 (and that DTC will render ICL warnings, see its system reaction).
Diagnostic depth
A current above the maximum level has been detected on any of the two outputs for the "H-bridge" driving the motor. The output can deliver approximately 10 A continuously, and a current higher than that through the motor circuit will set this DTC.
- Short circuit due to damaged or broken wires - The connected component is out of order